Bug 402176

Summary:	Cantor crashes when trying to execute cell with SageMath backend
Product:	[Applications] cantor	Reporter:	Lasse Flygenring-Harrsen <Lasse>
Component:	general	Assignee:	Filipe Saraiva <filipe>
Status:	RESOLVED WORKSFORME
Severity:	crash	CC:	alexander.semke, alexanderrieder, jscott
Priority:	NOR	Keywords:	drkonqi
Version:	unspecified
Target Milestone:	---
Platform:	Debian testing
OS:	Linux
See Also:	https://bugs.kde.org/show_bug.cgi?id=404752
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Lasse Flygenring-Harrsen 2018-12-15 23:07:49 UTC

Application: cantor (18.08.1)

Qt Version: 5.11.2
Frameworks Version: 5.51.0
Operating System: Linux 4.18.0-3-amd64 x86_64
Distribution: Debian GNU/Linux buster/sid

-- Information about the crash:
Cantor version 18.08.1 and SageMath version 8.3 on Debian Buster.

The crash can be reproduced every time.

-- Backtrace:
Application: Cantor (cantor), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fc23f3aa300 (LWP 32593))]

Thread 4 (Thread 0x7fc234cfd700 (LWP 32596)):
#0  0x00007fc243192e6c in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x56222a771a08) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fc243192e6c in __pthread_cond_wait_common (abstime=0x0, mutex=0x56222a7719b8, cond=0x56222a7719e0) at pthread_cond_wait.c:502
#2  0x00007fc243192e6c in __pthread_cond_wait (cond=0x56222a7719e0, mutex=0x56222a7719b8) at pthread_cond_wait.c:655
#3  0x00007fc2353debab in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#4  0x00007fc2353de8d7 in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#5  0x00007fc24318cf2a in start_thread (arg=0x7fc234cfd700) at pthread_create.c:463
#6  0x00007fc244008edf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fc237430700 (LWP 32595)):
#0  0x00007fc243ffe739 in __GI___poll (fds=0x7fc230004230, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fc242612e46 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc242612f6c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc244527d13 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fc2444d4d0b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc2443240c6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc24358e545 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007fc24432dc97 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc24318cf2a in start_thread (arg=0x7fc237430700) at pthread_create.c:463
#9  0x00007fc244008edf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fc23dd2c700 (LWP 32594)):
#0  0x00007fc243ffe739 in __GI___poll (fds=0x7fc23dd2bcb8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fc241e7dcf7 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fc241e7f91a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fc23eebe519 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fc24432dc97 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc24318cf2a in start_thread (arg=0x7fc23dd2c700) at pthread_create.c:463
#6  0x00007fc244008edf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fc23f3aa300 (LWP 32593)):
[KCrash Handler]
#6  0x00007fc2443a57ac in QString::toInt(bool*, int) const () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc23449f07d in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/cantor/backends/cantor_sagebackend.so
#8  0x00007fc23449f3f1 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/cantor/backends/cantor_sagebackend.so
#9  0x00007fc22ec42621 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/libcantorpart.so
#10 0x00007fc22ec42c65 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/libcantorpart.so
#11 0x00007fc22ec78c95 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/libcantorpart.so
#12 0x00007fc2444ff28b in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007fc244e45ee2 in QAction::triggered(bool) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#14 0x00007fc244e484f0 in QAction::activate(QAction::ActionEvent) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#15 0x00007fc244e48da4 in QAction::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007fc244e4c491 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007fc244e53ad0 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007fc2444d6039 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007fc2448aa6d3 in QShortcutMap::dispatchEvent(QKeyEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#20 0x00007fc2448aa7ab in QShortcutMap::tryShortcut(QKeyEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#21 0x00007fc24485fa86 in QWindowSystemInterface::handleShortcutEvent(QWindow*, unsigned long, int, QFlags<Qt::KeyboardModifier>, unsigned int, unsigned int, unsigned int, QString const&, bool, unsigned short) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#22 0x00007fc24487c2ad in QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#23 0x00007fc244881a05 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#24 0x00007fc24485bd8b in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#25 0x00007fc23ef5185b in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#26 0x00007fc2444d4d0b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007fc2444dce82 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x0000562229b56d17 in  ()
#29 0x00007fc243f33b17 in __libc_start_main (main=0x562229b56040, argc=5, argv=0x7ffff7089f58, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffff7089f48) at ../csu/libc-start.c:310
#30 0x0000562229b571ca in _start ()
[Inferior 1 (process 32593) detached]

Reported using DrKonqi

Comment 1 Alexander Semke 2018-12-16 08:44:16 UTC

We did a lot of improvements in this area in the 18.12 release. 18.12 is already out there. Can you please give this release a chance?

Comment 2 John Scott 2019-04-07 02:11:24 UTC

Per #404752 which I reported, your crash was probably caused by an issue in Debian. Can you check whether this occurs after upgrading to sagemath 8.6-6?

Comment 3 Christoph Feck 2019-04-25 08:53:49 UTC

If you can provide the information requested in comment #2, please add it.

Comment 4 Christoph Feck 2019-05-14 23:06:07 UTC

To further investigate this issue, KDE developers need the information requested in comment #2. If you can provide it, or need help with finding that information, please add a comment.

Comment 5 Bug Janitor Service 2019-05-29 04:33:08 UTC

Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!

Comment 6 Bug Janitor Service 2019-06-13 04:33:11 UTC

This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

Thank you for helping us make KDE software even better for everyone!